Chain wrench.



PATBNTED JUNE 16, 1 908.

F- W. TRABOLD.

CHAIN WRENCH.

APPLICATION FILED mm: s. 1907. I

@iW u g v 0 FRANK W. TRABOLD, oF oHNsTowN, PENNSYLVANIA.

CHAIN WRENCH.

Specification of Letters Patent.

Patented June 16, 1908.

Application filed June 5, 1907. Serial No. 377,318.

To all whom it may concern:

Be it known that I, FRANK W. TRABOLD, a citizen of the United States,residing at J ohnstown, in the county of Cambria and State ofPennsylvania, have invented an Improvement in Chain Wrenches, of whichthe following is a specification.

Heretofore, chain wrenches comprising a lever handle, jaw memberssecured thereto and a link chain connected to the handle, have beenprovided with lugs or hooks, either on the handle or on the jaw membersin such positions as to be adapted to engage the link chain or portionthereof after the same has been passed around the ipe or other articleto be turned, to secure t e chain in position and effect the properworking of the wrench. I have found from experience however that thearts of chain wrenches so constructed are 1able to work loose throughwear or by means of neglect and when these parts do work loose, thepivot pins or other parts'of the chain are likely to come out of or awayfrom the hook lugs on the jaw members and cause the wrench to slip.

Now the object of my present invention is to provide a chain wrench soconstructed that a serious slip of the wrench in the use of the same, isrendered practically impossible, and in carrying out the same, I preferto employ a lever handle, jaw members, means for securing the jawmembers to the handle, a chain pivotally mounted in the end of thehandle, means engaged by the chain in the normal use of the wrench, andmeans to be engaged by the chain should the last aforesaid means becomedisengaged from the chain, while the wrench is in use.

In the drawing, Figure 1 is an elevation and partial section of myimproved chain wrench. Fig. 2 is a plan view of the parts shown inFig. 1. Fig. 3 is a cross section on line :20, cc, Fig. 1. Fig. 4 is anelevation of one of the jaw members, showing the inner face thereof, andFig. 5 is an elevation of the end of the lever handle.

In the drawing, a designates the lever handle and b, b, are the twosimilar oppositely placed jaw members of the wrench, as is customary inthese wrenches. Each jaw is provided in its inner surface with a recess10 adapted to receive the end of the lever handle, both jaw members I)being provided, as is also customary, with serrated or toothed edges 1).The lever handle a and the jaw members I) are secured together by meansof a tie-bolt 0 passed through these parts or otherwise as may bedesired. The end of the leverhandle is rovided with a slot 11 adapted toreceive tie link 12 at the end of the chain d, this link 12 fittingwithin the slot 11 and pivotally connected therein on the tiebolt 0, andthe chain (1 of the plate links 13 is connected together by pivot pins14 in any desired manner, and these pivot pins 14 extend an vap reciabledistance beyond the outer f-acesof the outer plate links 13. Each of thejaw members I) in similar positions on both sides of the recess 10therein, is pro vided with hook lugs indicated at e and the end of thelever handle on both sides of the slot 11 is provided with lugs f,parallel with one another and each provided with hook ends g, itbeingunderstood that these hook ends g, together with the lugs f andalso the hook lugs e, are preferably formed integral with the leverhandle. a and the jaw members b respectively.

In the use of the hereinbefore described Wrench, a chain (1 is passedbeneath and around over'the pipe h or other device to be turned and thehook lugs e are engaged by the extremities of one of the pivot ins 14 atthe same time one pair of serrate sides of the jaw members I) areresting upon the pipe h in such a position that when the lever handle israised, the teeth of these serrated edges will grip the pipe, the hooksg and the lug hooks 0 being so placed that in the ordinary use of thewrench, the former are not engaged normally by the next adjacent pivotpin of the chain to that engaging the hook lugs e. The hook lugs 6 thusconstitute what I may term the normal locking means which are adapted tobe engaged by the chain in use. It will be manifest however, that shouldthe jaws b, b, of the wrench separate by the loosening of the tie-bolt cor from any other reason, or should the chain slip for any reason, so asto cause the ends of the pivot pin engaged in the hook lugs c to becomedisengaged therefrom, it will be apparent that there is practically noyielding of the wrench, as the next adjacent pivot in to theone that hasslipped or been removed from the'hook lugs e will engage-the hookmembers 9 on the end of the lever hanble a. The hook members 9 thusconstitute what I may designate as the safety locking means which arebrought into action only when there is a failure of the normal lockingaction. It is essential to my invention that the safety locking meansshall in all working positions of the wrench lie in the direct line ofpull of the pivot pin which they are adapted to engage, so that when thenormal locking action fails the safety locking means will engage thechain with certainty. It will also be understood that without departingfrom the nature and spirit of my invention, I may so place the hook lugse and hook members g that they will in the use of the wrench, be engagedsimultaneously with the ends of any pair of pivot pins 14 of the chain(1, and if necessary, the surface of the lever handle coming betweeneach pair of hook lugs 0 may be recessed at 15 to insure the properengagement between the ends of the pivot pins 14 and the hook lugs e.

I claim as my invention:

1. A chain pipe wrench having a lever handle, jaw members at theextremity thereof, a chain pivotally mounted on said lever handle, asuccession of engaging faces on said chain, a normal lock and a safetylock spaced apart a distance different from the distance between saidfaces, so that when one of the latter is in contact with said normallock an adjacent face is in close proxof the wrench.

2. A chain pipe wrench having a lever handle, jaw members at theextremity thereof, a chain pivotally mounted on said lever handle, asuccession of engaging faces on said chain, a normal lock and a safetylock spaced apart a distance different from the relation to such facethat such lock is in line of pull thereof in all working positions ofthe wrench, one of said locks being formed on the handle and the otheron said jaw member.

3. A chain pipe wrench having a lever handle, aw members at theextremity thereof, a chain pivotally mounted on said lever handle, asuccession of engaging faces on said chain, a normal lock and a safetylock spaced apart a distance different from the distance between saidfaces, so that when one of the latter is in contact with said normallock an adjacent face is in close proximity to, but out of contact withsaid safety lock, said safety lock being so disposed with relation tosuch face that such lock is in line of pull thereof in all workingpositions of the wrench, said normal lock being formed on said jawmembers and said safety lock being formed on said handle.

4. A chain pipe wrench having a lever handle, jaw members at theextremity thereof, a chain pivotally mounted on said lever handle, asuccession of engaging faces on said chain, a normal lock and a safetylock spaced apart a distance different from the distance between saidfaces, so that when one of the latter is in contact with said normallock an adjacent face is in close proximity to, but out of contact withsaid safetylock, said safety lock being so disposed with relation tosuch face that such lock is in line .of pull thereof in all working.positions of the

